Unable to debug ESP32-WROVER unless "Flash SPI Speed" set to 20MHz (OCD-694)

[copleston]

JTAG Interface: ESP-PROG
MCU: LyraT 4.3

After much trial and error, I managed to successfully get the ESP-PROG interfacing with my Lyra-T development board. I kept on getting Receiving JTAG scan chain interrogation failed: all ones (or zeros) error similar to #35. I tried everything from different cables, connectors, microcontrollers, but that fix, in the end, was to set the SPI Flash Speed to 20MHz.

This wasn't anywhere in the documentation so there's a chance it could be a bug, if not, it's definitely worth adding to the Tips & Quirks Documentation.
I'd be happy to put in a pull request for the Docs if it seems like a reasonable thing to do.

[gerekon]

Hmm..., have not had such problem. Have you tried with lower JTAG freq, w/o lowering SPI flash speed?

[erhankur]

Closed due to inactivity.